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Reports a missing <code>alt</code> attribute in a <code>img</code> or <code>applet</code> tag or in a <code>area</code> element of an image map. Suggests adding a required attribute with a text alternative for the contents of the tag. Based on WCAG 2.0: <a href="https://www.w3.org/TR/WCAG20-TECHS/H24.html">H24</a>, <a href="https://www.w3.org/TR/WCAG20-TECHS/H35.html">H35</a>, <a href="https://www.w3.org/TR/WCAG20-TECHS/H36.html">H36</a>, <a href="https://www.w3.org/TR/WCAG20-TECHS/H37.html">H37</a>.
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